must construct QApplication before constructing QPaintDevice

**dvmorris** · 20th April 2007, 22:44

Is there anything else that can cause this error?

I am using this bash script (http://qtcentre.org/forum/f-qt-progr...ighlight=qtxml) which embeds 4 Qt frameworks into the app and makes it into a dmg file, and once I do that, I receive this error. Before I embed the frameworks I do not get this error.

I can't seem to find any other reason why it would be caused. If anyone has any ideas let me know.
thanks for the help,
dave

**wysota** · 20th April 2007, 23:21

You surely have some global object somewhere which is created before QApplication.

**dvmorris** · 20th April 2007, 23:24

so that means that it must be outside of any class definition? I really can't find it. Why would it work before embedding the frameworks though?

**wysota** · 20th April 2007, 23:33

I have no idea. I don't even know why you use that script. AFAIK Qt can create bundles by itself.

**dvmorris** · 20th April 2007, 23:39

I've never seen anything on the Qt documentation about making dmg's. I found the script here originally:

http://qtnode.net/wiki/Distributing_Mac_Qt_applications

The script even says the guy who created it doesn't use it anymore, but I've never found a better way to do it. Do you have any suggestions. All I really need it for is to embed the QtCore, QtXml, QtOpenGL, and QtGui frameworks into my .app.

**wysota** · 20th April 2007, 23:42

http://doc.trolltech.com/latest/deployment-mac.html

Anyway that's not the issue here. There is something wrong with your code.

**dvmorris** · 20th April 2007, 23:59

I really don't see anything wrong with it. Will it definitely have the word static in it? The code is way too large to post up here, so I guess I'll just keep looking. I don't understand why it works with the absolute paths to the libraries, but not with the relative paths.

One thing I noticed that this script does that seems strange is in the results of

otool -L

before the script

Qt Code:

Switch view

/Library/Frameworks/Python.framework/Versions/2.5/Python (compatibility version 2.5.0, current version 2.5.0)
        /Library/Frameworks/3DconnexionClient.framework/Versions/A/3DconnexionClient (compatibility version 1.0.0, current version 1.0.0)
        /usr/local/Trolltech/Qt-4.3.0beta/lib/QtXml.framework/Versions/4/QtXml (compatibility version 4.3.0, current version 4.3.0)
        /usr/local/Trolltech/Qt-4.3.0beta/lib/QtOpenGL.framework/Versions/4/QtOpenGL (compatibility version 4.3.0, current version 4.3.0)
        /System/Library/Frameworks/QuickTime.framework/Versions/A/QuickTime (compatibility version 1.0.0, current version 12.0.0)
        /usr/local/Trolltech/Qt-4.3.0beta/lib/QtGui.framework/Versions/4/QtGui (compatibility version 4.3.0, current version 4.3.0)
        /System/Library/Frameworks/Carbon.framework/Versions/A/Carbon (compatibility version 2.0.0, current version 128.0.0)
        /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit (compatibility version 45.0.0, current version 824.42.0)
        /usr/local/Trolltech/Qt-4.3.0beta/lib/QtCore.framework/Versions/4/QtCore (compatibility version 4.3.0, current version 4.3.0)
        /usr/lib/libz.1.dylib (compatibility version 1.0.0, current version 1.2.3)
        /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 88.3.6)
        /usr/lib/libiconv.2.dylib (compatibility version 5.0.0, current version 5.0.0)
        /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices (compatibility version 1.0.0, current version 22.0.0)
        /System/Library/Frameworks/OpenGL.framework/Versions/A/OpenGL (compatibility version 1.0.0, current version 1.0.0)
        /System/Library/Frameworks/AGL.framework/Versions/A/AGL (compatibility version 1.0.0, current version 1.0.0)
        /usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version 7.4.0)
        /usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0)

/Library/Frameworks/Python.framework/Versions/2.5/Python (compatibility version 2.5.0, current version 2.5.0)
        /Library/Frameworks/3DconnexionClient.framework/Versions/A/3DconnexionClient (compatibility version 1.0.0, current version 1.0.0)
        /usr/local/Trolltech/Qt-4.3.0beta/lib/QtXml.framework/Versions/4/QtXml (compatibility version 4.3.0, current version 4.3.0)
        /usr/local/Trolltech/Qt-4.3.0beta/lib/QtOpenGL.framework/Versions/4/QtOpenGL (compatibility version 4.3.0, current version 4.3.0)
        /System/Library/Frameworks/QuickTime.framework/Versions/A/QuickTime (compatibility version 1.0.0, current version 12.0.0)
        /usr/local/Trolltech/Qt-4.3.0beta/lib/QtGui.framework/Versions/4/QtGui (compatibility version 4.3.0, current version 4.3.0)
        /System/Library/Frameworks/Carbon.framework/Versions/A/Carbon (compatibility version 2.0.0, current version 128.0.0)
        /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit (compatibility version 45.0.0, current version 824.42.0)
        /usr/local/Trolltech/Qt-4.3.0beta/lib/QtCore.framework/Versions/4/QtCore (compatibility version 4.3.0, current version 4.3.0)
        /usr/lib/libz.1.dylib (compatibility version 1.0.0, current version 1.2.3)
        /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 88.3.6)
        /usr/lib/libiconv.2.dylib (compatibility version 5.0.0, current version 5.0.0)
        /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices (compatibility version 1.0.0, current version 22.0.0)
        /System/Library/Frameworks/OpenGL.framework/Versions/A/OpenGL (compatibility version 1.0.0, current version 1.0.0)
        /System/Library/Frameworks/AGL.framework/Versions/A/AGL (compatibility version 1.0.0, current version 1.0.0)
        /usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version 7.4.0)
        /usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0)

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after the script

Qt Code:

Switch view

/Library/Frameworks/Python.framework/Versions/2.5/Python (compatibility version 2.5.0, current version 2.5.0)
        /Library/Frameworks/3DconnexionClient.framework/Versions/A/3DconnexionClient (compatibility version 1.0.0, current version 1.0.0)
        @executable_path/../Frameworks/QtXml.framework/Versions/4/QtXml (compatibility version 4.3.0, current version 4.3.0)
        @executable_path/../Frameworks/QtOpenGL.framework/Versions/4/QtOpenGL (compatibility version 4.3.0, current version 4.3.0)
        /System/Library/Frameworks/QuickTime.framework/Versions/A/QuickTime (compatibility version 1.0.0, current version 12.0.0)
        @executable_path/../Frameworks/QtGui.framework/Versions/4/QtGui (compatibility version 4.3.0, current version 4.3.0)
        /System/Library/Frameworks/Carbon.framework/Versions/A/Carbon (compatibility version 2.0.0, current version 128.0.0)
        /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit (compatibility version 45.0.0, current version 824.42.0)
        @executable_path/../Frameworks/QtCore.framework/Versions/4/QtCore (compatibility version 4.3.0, current version 4.3.0)
        /usr/lib/libz.1.dylib (compatibility version 1.0.0, current version 1.2.3)
        /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 88.3.6)
        /usr/lib/libiconv.2.dylib (compatibility version 5.0.0, current version 5.0.0)
        /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices (compatibility version 1.0.0, current version 22.0.0)
        /System/Library/Frameworks/OpenGL.framework/Versions/A/OpenGL (compatibility version 1.0.0, current version 1.0.0)
        /System/Library/Frameworks/AGL.framework/Versions/A/AGL (compatibility version 1.0.0, current version 1.0.0)
        /usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version 7.4.0)
        /usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0)

/Library/Frameworks/Python.framework/Versions/2.5/Python (compatibility version 2.5.0, current version 2.5.0)
        /Library/Frameworks/3DconnexionClient.framework/Versions/A/3DconnexionClient (compatibility version 1.0.0, current version 1.0.0)
        @executable_path/../Frameworks/QtXml.framework/Versions/4/QtXml (compatibility version 4.3.0, current version 4.3.0)
        @executable_path/../Frameworks/QtOpenGL.framework/Versions/4/QtOpenGL (compatibility version 4.3.0, current version 4.3.0)
        /System/Library/Frameworks/QuickTime.framework/Versions/A/QuickTime (compatibility version 1.0.0, current version 12.0.0)
        @executable_path/../Frameworks/QtGui.framework/Versions/4/QtGui (compatibility version 4.3.0, current version 4.3.0)
        /System/Library/Frameworks/Carbon.framework/Versions/A/Carbon (compatibility version 2.0.0, current version 128.0.0)
        /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit (compatibility version 45.0.0, current version 824.42.0)
        @executable_path/../Frameworks/QtCore.framework/Versions/4/QtCore (compatibility version 4.3.0, current version 4.3.0)
        /usr/lib/libz.1.dylib (compatibility version 1.0.0, current version 1.2.3)
        /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 88.3.6)
        /usr/lib/libiconv.2.dylib (compatibility version 5.0.0, current version 5.0.0)
        /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices (compatibility version 1.0.0, current version 22.0.0)
        /System/Library/Frameworks/OpenGL.framework/Versions/A/OpenGL (compatibility version 1.0.0, current version 1.0.0)
        /System/Library/Frameworks/AGL.framework/Versions/A/AGL (compatibility version 1.0.0, current version 1.0.0)
        /usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version 7.4.0)
        /usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0)

To copy to clipboard, switch view to plain text mode

saying @executable_path seems wrong, but I don't really know enough about it to know whether that's right or not.

**wysota** · 21st April 2007, 00:01

No, the object doesn't have to be static. It's enough if it's global. Maybe your Qt installation is somehow broken?

**dvmorris** · 21st April 2007, 00:06

it's 4.3 beta, but 4.2.3 had other errors that I couldn't figure out, and I found this post that said someone fixed the same errors I was having by upgrading to 4.3beta, so I did, and it fixed those errors, but gave me new ones.

oh joy. i really appreciate all your help. Changing my app to Qt from fltk has been a rollercoaster ride so far. thanks again,
dave

**wysota** · 21st April 2007, 00:21

Try running your script on a dummy application and see if the problem persists. If so, this could mean a somehow invalid Qt installation or a problem with the script. But if it works, then surely the problem lies within your code.

**dvmorris** · 21st April 2007, 02:43

I just tried on an example app , the 2dpainting opengl sample, and it did the same error. that's good to know. Now I just need to find a better script. Perhaps it's the order of the frameworks that I'm including that is the problem. I figured QtCore would need to be first...

I will try a different script. Thanks for your help,
dave

**wysota** · 21st April 2007, 12:16

The script might be fine. If it's in the wiki then I assume it works for someone. The problem may lie in cooperation between the script and your Qt compilation.